(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

sin2x-tan2x=-2(sinx)^2(tan2x)

2. The attempt at a solution

I have like two pages of attempts, but I don't know if it would be useful to copy it into the forum. :|

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# Homework Help: Prove the identity

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